CN105116350A - SOC variation and discharge power conversion factor measurement method when in discharge of power battery - Google Patents
SOC variation and discharge power conversion factor measurement method when in discharge of power battery Download PDFInfo
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- CN105116350A CN105116350A CN201510642090.9A CN201510642090A CN105116350A CN 105116350 A CN105116350 A CN 105116350A CN 201510642090 A CN201510642090 A CN 201510642090A CN 105116350 A CN105116350 A CN 105116350A
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- 238000000691 measurement method Methods 0.000 title abstract 3
- 238000000034 method Methods 0.000 claims abstract description 43
- 238000007599 discharging Methods 0.000 claims abstract description 39
- 230000005611 electricity Effects 0.000 claims description 83
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000036962 time dependent Effects 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 2
- 239000000523 sample Substances 0.000 claims description 2
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 13
- 230000010354 integration Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 4
- 229910010710 LiFePO Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910018095 Ni-MH Inorganic materials 0.000 description 1
- 229910018477 Ni—MH Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Abstract
The invention discloses a power battery discharge power conversion factor measurement method which is accurate in result and simple. The method comprises the following steps: first discharging a fully-charged single battery to a discharge end voltage at a C/3 rate and a constant current under a standard stipulation condition, and obtaining a standard discharge electric quantity QSD in a calculation manner; performing the constant-current discharge at different currents I in a same way, and obtaining the discharge electric quantity value QID of the battery at different currents I by virtue of calculation; fitting various different discharge currents I and the corresponding discharge electric quantity conversion factor KID=fID(I). The invention also provides an SOC variation measurement method when in discharge of a power battery which is accurate in test, simple and easy. The electric quantity of the power battery discharged at the current I is converted to the release electric quantity QZ=xif ID(I)Idt discharged at the C/3 rate; when the power battery is discharged, SOC variation delta SOC=QZ/Qn, and Qn is a quoted capacity.
Description
Technical field
The present invention relates to electrochmical power source applied technical field, particularly a kind of electrokinetic cell measurement of discharging, especially battery discharge electricity conversion factor and SOC changed measurement metering method.
Background technology
Electrokinetic cell SOC variable quantity is the basis calculating battery SOC, and electrokinetic cell SOC is an important parameter in electric automobile whole energy control strategy and battery management system, SOC information improves important in inhibiting to the efficient management of battery and vehicle performance accurately.SOC and StateofCharge, means state-of-charge, is also dump energy.There is no unified definition about battery SOC in the world at present, but great majority adopt battery electric quantity to define.Such as United States advanced battery federation (USABC) definition SOC in " batteries of electric automobile laboratory manual " is: under the discharge-rate of specifying, the ratio of rated capacity under battery remaining power and condition of equivalent.Due under different charge-discharge magnification, the rated capacity of battery is different, and China GB/T18332.2-2001 is the rated capacity Q with rated condition C/3 multiplying power discharging definition battery
n.
The electrokinetic cell of electric automobile in use, needs to pay close attention to many state parameters of battery, wherein, measures electrokinetic cell SOC variable quantity and has significant meaning: 1) can SOC value that accurately preestimating battery is current by battery SOC variable quantity accurately; 2) SOC value of battery is the basis of formulating electric automobile whole energy control strategy accurately; 3) SOC value of battery is the important parameter carrying out battery-efficient management accurately; 4) for pure electric automobile, the continuous mileage of speeding of the measurable automobile of SOC value of battery accurately.
In order to accurately calculate the SOC of battery when discharging, should by the electricity under different discharge current I by the unified release electricity to C/3 multiplying power discharging of electricity conversion factor, battery remaining power can be obtained, with battery remaining power and rated capacity Q by the release electricity converting battery C/3 multiplying power discharging
nratio can accurately estimating battery electric discharge time SOC value.
Therefore, when definition battery discharge electricity conversion factor measuring method and electrokinetic cell electric discharge, the measuring method of SOC variable quantity is necessary.
Summary of the invention
The object of this invention is to provide the battery discharge electricity conversion factor measuring method that a kind of result is accurate, method is easy, can be the release electricity of C/3 multiplying power discharging by the conversion of the electricity of battery under any discharge current I by this battery discharge electricity conversion factor.
To achieve these goals, electrokinetic cell discharge electricity amount conversion factor measuring method of the present invention, comprises the steps:
(1) will be in completely charged battery cell under master gauge fixed condition with C/3 multiplying power constant-current discharge to final discharging voltage, the time dependent curve of record battery discharge current, adopts ampere-hour integral method to calculate the standard discharge electricity amount Q of battery C/3 multiplying power discharging
sD; C is that battery 3h leads rated capacity;
(2) will be in completely charged battery cell under master gauge fixed condition with electric current I constant-current discharge to final discharging voltage, calculate the charge value Q that battery discharges in electric current I
iD;
(3) battery discharges electricity Q under being converted to C/3 multiplying power discharging with the electricity that electric current I is discharged
zbattery discharge electricity conversion factor K
iD=Q
sD/ Q
iD;
(4) battery cell is obtained with the discharge electricity amount conversion factor K of multiple different electric current I constant-current discharge
iD; By discharge current I, discharge electricity amount conversion factor by matching, obtain the functional relation of discharge electricity amount conversion factor and electric current I: K
iD=f
iD(I).
Described electrokinetic cell discharge electricity amount conversion factor measuring method, the electric current I value of the multiple different electric current I in described step (3) is 0.1C, 0.2C, 0.3C, 0.4C, 0.5C, 0.6C, 0.7C, 0.8C, 1C, 1.5C, 2C.
Described electrokinetic cell discharge electricity amount conversion factor measuring method, after charging or discharge off, by described battery standing 1 hour.
Described electrokinetic cell discharge electricity amount conversion factor measuring method, the probe temperature of battery cell discharge and recharge is master gauge fixed condition.
The beneficial effect of electrokinetic cell discharge electricity amount conversion factor measuring method: the present invention is by battery discharge electricity conversion factor K
iDthe electricity Q discharged under battery is converted to C/3 multiplying power discharging with the electricity that electric current I is charged
z.By this conversion electricity Q
z=∫ K
iDidt=∫ f
iD(I) (ampere-hour integral method after namely temporally carrying out integration to electric current I, then is multiplied by K to Idt
iDconvert.When discharging, current symbol is got negative).In order to obtain functional relation K
iD=f
iD(I), present invention employs approximating method, that is, by different discharge current I and the discharge electricity amount conversion factor K corresponding with this discharge current
iDby matching, obtain the functional relation K of discharge electricity amount conversion factor and electric current I
iD=f
iD(I).The functional relation K that matching obtains
iD=f
iD(I) applied widely, for different discharge current I, only have and substitute into functional relation K
iD=f
iD(I) battery discharge electricity conversion factor K can be obtained
iD, simple, test more efficient and convenient, measurement result is stablized, applied widely.
During by discharge current I and the matching of discharge electricity amount conversion factor, by linear fit or fitting of a polynomial.
The present invention additionally provides the measuring method of SOC variable quantity when a kind of electrokinetic cell accurate, simple with test discharges simultaneously.
During the electric discharge of this electrokinetic cell, the measuring method of SOC variable quantity comprises the steps:
(1) by be in final discharging voltage battery cell at normal temperatures with C/3 rate of charge constant-current charge to end of charge voltage, constant-voltage charge is less than 0.5A to electric current again, finally, be discharged to final voltage, the time dependent curve of record battery cell discharge current, adopt ampere-hour integral method to obtain battery cell discharge electricity amount, be denoted as the rated capacity Q of electrokinetic cell monomer
n;
(2) above-mentioned electrokinetic cell discharge electricity amount conversion factor measuring method is adopted to obtain discharge electricity amount conversion factor K
iDwith the functional relation of electric current I: K
iD=f
iD(I);
(3) by discharge electricity amount conversion factor K
iDelectricity Q is discharged under electrokinetic cell is converted to C/3 multiplying power discharging with the electricity that electric current I is discharged
z, conversion electricity Q
z=∫ K
iDidt=∫ K
iD=f
iD(I) Idt, when discharging, current symbol is got negative; When discharging with different electric current I, electrokinetic cell SOC variable quantity △ SOC is the electricity Q be converted under C/3 discharge-rate
zwith the ratio of rated capacity, computing formula is △ SOC=Q
z/ Q
n.
The beneficial effect of the measuring method of SOC variable quantity during electrokinetic cell electric discharge: the present invention is by battery discharge electricity conversion factor K
iDthe electricity Q discharged under battery is converted to C/3 multiplying power discharging with the electricity that electric current I is discharged
z, by this conversion electricity Q
z=∫ K
iDidt=∫ f
iD(I) (ampere-hour integral method after namely temporally carrying out integration to electric current I, then is multiplied by K to Idt
iDconvert) and rated capacity Q
ncompare and can obtain with electrokinetic cell SOC variable quantity △ SOC=Q during different electric current I electric discharge
z/ Q
n.The measuring method of this SOC variable quantity △ SOC is simple, tests more efficient and convenient, and measurement result is stablized, applied widely.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the charged electric quantity change measuring method of accumulator of the present invention.
Fig. 2 is different charging current and the polynomial fitting curve figure of different current charges electricity conversion factor.
Fig. 3 is different discharge current and the polynomial fitting curve figure of different current discharge electricity conversion factor.
Embodiment
By following description also by reference to the accompanying drawings, the present invention will become more clear, and these accompanying drawings are for explaining embodiments of the invention.
With reference now to accompanying drawing, describe embodiments of the invention, element numbers similar in accompanying drawing represents similar element.
Before explanation accumulator electric-quantity conversion factor measuring method of the present invention, first the several concepts related to are described.
Charge capacity conversion factor: K
iC=Q
sD/ Q
iC
Discharge electricity amount conversion factor: K
iD=Q
sD/ Q
iD
Also can be described in detail to invention accumulator electric-quantity conversion factor measuring method below.
Embodiment is the LiFePO that certain company produces with battery cell below
4type lithium-ion-power cell is example, and it is 10Ah that its 3h leads rated capacity C, and rated voltage is 3.2V, and end of charge voltage is 3.65V, and final discharging voltage is 2.5V.
Below with reference to Fig. 1 and composition graphs 2,3, the measuring method of accumulator of the present invention charged electricity SOC variable quantity is described.Said method comprising the steps of:
Step S1, according to battery types determination charging system and discharge system, in the present embodiment, battery types is LiFePO
4battery (determine that charging system and discharge system are the prerequisites to battery implementation and operation, according to these systems can determine how battery to be full of electricity, how by complete for battery tele-release, measure rated capacity, determine end of charge voltage or termination condition, final discharging voltage or termination condition; All will leave standstill a period of time and just can carry out next operation often completing a charge or discharge process, no longer there is any variation with cell voltage and be as the criterion in time of repose, usually needs 1h in this example; Charging system and discharge system both can be provided by cell production companies, also can corresponding lead-acid battery, lithium battery and Ni-MH battery set respectively according to national standard such as QC/T742-2006, QC/T743-2006 and QC/T744-2006);
Step S2, determines LiFePO
4the rated capacity of battery: by LiFePO
4its residual electricity discharges by the discharge system (with 0.33C and 3.3A constant-current discharge) that electric battery is determined according to step S1, then the charging system (with 0.33C and 3.3A constant-current charge) determined according to step S1 charges to end of charge voltage, constant voltage discharge is less than 0.5A to electric current again, finally being discharged to final discharging voltage, being rated capacity Q from being full of the electricity that electricity condition releases to final discharging voltage
n, in the present embodiment, rated capacity Q
nmeasured value be 10.57Ah;
Step S3, determines LiFePO
4the standard charging electricity Q of battery
sC: by LiFePO
4battery cell will be in completely charged battery cell (with C/3 multiplying power constant-current discharge) under 20 ± 5 DEG C of conditions according to the discharge system that step S1 determines and be discharged to final discharging voltage stopping, then the charging system (with C/3 multiplying power constant-current charge) determined according to step S1 charges to end of charge voltage to be stopped, in time integration is carried out to charging current, obtains the standard charging electricity Q of battery
sC;
Step S4, determines LiFePO
4the standard discharge electricity amount Q of battery
sD: by LiFePO
4the charging system that battery cell is determined according to step S1 charges to end of charge voltage by being in the battery cell of final discharging voltage (with C/3 multiplying power constant-current charge) under 20 ± 5 DEG C of conditions, then (cell voltage is to 2.5V to be discharged to final discharging voltage for the discharge system (with C/3 multiplying power constant-current discharge) determined according to step S1, the battery minimum voltage that can reach under normal circumstances), in time integration is carried out to discharge current, is LiFePO
4the standard discharge electricity amount Q of battery
sD;
Step S5, determines LiFePO
4the charge value Q that battery charges in different electric current I
iC: need in this example to be in completely charged LiFePO
4battery cell (with C/3 multiplying power constant-current discharge) under 20 ± 5 DEG C of conditions is discharged to final discharging voltage, after static 1h, during with 0.1C multiplying power constant-current charge to end of charge voltage 3.65V, and acquiescence charging complete, record LiFePO
4the time dependent current curve of battery, carries out to it charge value that integration obtains 0.1C multiplying power constant-current charge.Then complete with the charging process of 0.2C, 0.3C, 0.4C, 0.5C, 0.6C, 0.7C, 0.8C, 1C, 1.5C, 2C multiplying power with same step, and record the time dependent curve of corresponding electric current, respectively its integral and calculating is obtained to the charge value Q of corresponding different electric current constant-current charge
iC;
Step S6, determines LiFePO
4the charge value Q that battery discharges in different electric current I
iD: need in this example to be in the LiFePO of final discharging voltage
4battery cell (with C/3 multiplying power constant-current charge) under 20 ± 5 DEG C of conditions charges to end of charge voltage, after static 1h, with 0.1C multiplying power constant-current discharge to battery final voltage (final voltage is for 2.5V), and record LiFePO
4the time dependent current curve of battery, carries out to it discharge electricity amount value that integration obtains under 0.1C multiplying power.Then complete with the discharge process of 0.2C, 0.3C, 0.4C, 0.5C, 0.6C, 0.7C, 0.8C, 1C, 1.5C, 2C multiplying power with same step, and record the time dependent curve of corresponding electric current, respectively its integral and calculating is obtained to the charge value Q of corresponding different electric current constant-current discharge
iD;
Step S7, utilizes the expression formula K of charge capacity conversion factor
iC=Q
sD/ Q
iC, with standard discharge electricity amount Q
sDbe worth the charge value Q than upper 0.1C multiplying power constant-current charge
iC, obtain the charge capacity conversion factor under 0.1C multiplying power.Then use the same method and can obtain 10 charge capacity conversion factors corresponding to 0.2C, 0.3C, 0.4C, 0.5C, 0.6C, 0.7C, 0.8C, 1C, 1.5C, 2C multiplying power, take electric current as horizontal ordinate, charge capacity conversion factor is ordinate, these points are retouched observation on figure and can be approximately 4 curves, carry out fitting of a polynomial, the highest power of getting this curve is 4, i.e. K
iC=a
0i
4+ a
1i
3+ a
2i
2+ a
3i+a
4, wherein a
0, a
1, a
2, a
3, a
4for undetermined coefficient.Carry out curve fitting by least square method:
K
iC=-0.0010I
4+ 0.0408I
3-0.3974I
2+ 1.6057I+95.7327, is drawn on X-Y scheme, obtains Fig. 2;
Step S8, utilizes the expression formula K of discharge electricity amount conversion factor
iD=Q
sD/ Q
iD, with standard discharge electricity amount Q
sDbe worth the charge value Q than upper 0.1C multiplying power constant-current discharge
iD, obtain the discharge electricity amount conversion factor under 0.1C multiplying power.Then use the same method and can obtain 10 discharge electricity amount conversion factors corresponding to 0.2C, 0.3C, 0.4C, 0.5C, 0.6C, 0.7C, 0.8C, 1C, 1.5C, 2C multiplying power, take electric current as horizontal ordinate, discharge electricity amount conversion factor is ordinate, these points are retouched and to observe on figure and carry out residual analysis and can be approximately 4 curves, carry out fitting of a polynomial, the highest power of getting this curve is 4, i.e. K
iD=b
0i
4+ b
1i
3+ b
2i
2+ b
3i+b
4, wherein b
0, b
1, b
2, b
3, b
4for undetermined coefficient.Carry out curve fitting by least square method:
K
iD=-0.0026I
4+ 0.0955I
3-0.9406I
2+ 3.5690I+95.4936, is drawn on X-Y scheme, obtains Fig. 3;
Step S9, calculates the variable quantity of power battery charged state SOC: computing formula is △ SOC=∫ K
iidt/Q
n, K
ifor electricity conversion factor, when discharging, current symbol is got negative, K
ifor K
iD=-0.0026I
4+ 0.0955I
3-0.9406I
2+ 3.5690I+95.4936; When charging, current symbol is just got, K
ifor K
iC=-0.0010I
4+ 0.0408I
3-0.3974I
2+ 1.6057I+95.7327.
It should be noted that, charge-discharge magnification 0.1C, 0.2C, 0.3C, 0.4C, 0.5C, 0.6C, 0.7C, 0.8C, 1C, 1.5C, 2C of adopting in above-mentioned steps, other suitable multiplying powers also can be adopted to carry out discharge and recharge.
The present invention is when calculating battery SOC, battery remaining power used should by the electricity under different charging and discharging currents I by the release electricity of the unified conversion of electricity conversion factor to C/3 multiplying power discharging, thus the battery SOC estimation under different charging and discharging currents I is become under C/3 discharge-rate, battery remaining power and rated capacity Q
nratio, and the SOC value of the electrokinetic cell SOC that to be battery initial
0add SOC variable quantity, i.e. SOC=SOC
0+ △ SOC.
More than in conjunction with most preferred embodiment, invention has been described, but the present invention is not limited to the embodiment of above announcement, and should contain various carry out according to essence of the present invention amendment, equivalent combinations.
Claims (5)
1. electrokinetic cell discharge electricity amount conversion factor measuring method, comprises the steps:
(1) will be in completely charged battery cell under master gauge fixed condition with C/3 multiplying power constant-current discharge to final discharging voltage, the time dependent curve of record battery discharge current, adopts ampere-hour integral method to calculate the standard discharge electricity amount Q of battery C/3 multiplying power discharging
sD; C is that battery 3h leads rated capacity;
(2) will be in completely charged battery cell under master gauge fixed condition with electric current I constant-current discharge to final discharging voltage, calculate the charge value Q that battery discharges in electric current I
iD;
(3) battery discharges electricity Q under being converted to C/3 multiplying power discharging with the electricity that electric current I is discharged
zbattery discharge electricity conversion factor K
iD=Q
sD/ Q
iD;
(4) battery cell is obtained with the discharge electricity amount conversion factor K of multiple different electric current I constant-current discharge
iD; By discharge current I, discharge electricity amount conversion factor by matching, obtain the functional relation of discharge electricity amount conversion factor and electric current I: K
iD=f
iD(I).
2. electrokinetic cell discharge electricity amount conversion factor measuring method as claimed in claim 1, it is characterized in that, the electric current I value of the multiple different electric current I in described step (3) is 0.1C, 0.2C, 0.3C, 0.4C, 0.5C, 0.6C, 0.7C, 0.8C, 1C, 1.5C, 2C.
3. electrokinetic cell discharge electricity amount conversion factor measuring method as claimed in claim 1, is characterized in that, after charging or discharge off, by described battery standing 1 hour.
4. electrokinetic cell discharge electricity amount conversion factor measuring method as claimed in claim 1, it is characterized in that, the probe temperature of battery cell discharge and recharge is master gauge fixed condition.
5. when electrokinetic cell discharges, the measuring method of SOC variable quantity, comprises the steps:
(1) by be in final discharging voltage battery cell at normal temperatures with C/3 rate of charge constant-current charge to end of charge voltage, constant-voltage charge is less than 0.5A to electric current again, finally, be discharged to final voltage, the time dependent curve of record battery cell discharge current, adopt ampere-hour integral method to obtain battery cell discharge electricity amount, be denoted as the rated capacity Q of electrokinetic cell monomer
n;
(2) the arbitrary described electrokinetic cell discharge electricity amount conversion factor measuring method of claim 1-4 is adopted to obtain discharge electricity amount conversion factor K
iDwith the functional relation of electric current I: K
iD=f
iD(I);
(3) by discharge electricity amount conversion factor K
iDelectricity Q is discharged under electrokinetic cell is converted to C/3 multiplying power discharging with the electricity that electric current I is discharged
z, conversion electricity Q
z=∫ K
iDidt=∫ K
iD=f
iD(I) Idt, when discharging, current symbol is got negative; When discharging with different electric current I, electrokinetic cell SOC variable quantity △ SOC is the electricity Q be converted under C/3 discharge-rate
zwith the ratio of rated capacity, computing formula is △ SOC=Q
z/ Q
n.
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| CN108398647A (en) * | 2018-03-01 | 2018-08-14 | 杭州高特新能源技术有限公司 | Lithium battery difference charging and discharging curve acquisition methods |
| CN108398647B (en) * | 2018-03-01 | 2020-07-24 | 杭州高特新能源技术有限公司 | Method for acquiring different charging and discharging curves of lithium battery |
| CN111426956A (en) * | 2020-05-12 | 2020-07-17 | 南京林业大学 | Fractional order power battery SOC estimation method considering temperature and hysteresis effect |
| CN111426956B (en) * | 2020-05-12 | 2021-08-13 | 南京林业大学 | Fractional order power battery SOC estimation method considering temperature and hysteresis effect |
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